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D( x )
(9*x^4*y^6)/(4*Z^8) < 0
4*Z^8 = 0
(9*x^4*y^6)/(4*Z^8) = 0
(9*x^4*y^6)/(4*Z^8) < 0
(9*x^4*y^6)/(4*Z^8) < 0
(9*x^4*y^6)/(4*Z^8) = 0
9/4*Z^-8*x^4*y^6 = 0 // : 9/4*Z^-8*y^6
x^4 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
4*Z^8 = 0
4*Z^8 = 0
4*Z^8 = 0
x naleu017Cy do R
(9*x^4*y^6)/(4*Z^8) = 0
(9*x^4*y^6)/(4*Z^8) = 0
9/4*Z^-8*x^4*y^6 = 0 // : 9/4*Z^-8*y^6
x^4 = 0
x = 0
x belongs to the empty set
((9*x^4*y^6)/(4*Z^8))^(-3/2) = 0
x belongs to the empty set
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